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I know this is an old thread, but I figured I'd post up my solution to the codes I was experiencing in case anyone runs into something similar.
The P0451 code was related to the EVAP solenoid for sure. The hoses must have came loose underneath the manifold.
I ended up popping the P0069 code with the slip light shortly after my last post here back in April. Ended up just being something with the tune I was running. I switched to a tune from Bill @ Delicious Tuning and haven't had a code since.
However, I still had my startup hesitation/fail to start. Everything was pointing to flooding/too rich during start up. Well, I took some logs, sent them to Bill, he sent me an updated tune, and voila, problem solved. He never told me what it was, but I believe he tweaked the scaling for the injectors. I'm assuming the flow data I received with the injectors was incorrect.
Hope this helps someone.
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